What is Value Object Assembler pattern?
Ans. This pattern allows for composing a Value Object from different sources which could be EJBs, DAOs or Java objects. Q19. What is Value List Handler pattern? Ans. This pattern provides a sound solution for query execution and results processing. Q20. What is Service Locator pattern? Ans. It provides a solution for looking-up, creating and locating services and encapsulating their complexity. It provides a single point of control and it also improves performance. Q21. What is Data Access Object pattern? Ans. It provides a flexible and transparent access to the data, abstracts the data sources and hides the complexity of Data persistence layer. This pattern provides for loose coupling between business and data persistence layer. Q22. What is EJB Command pattern? Ans. Session Façade and EJB Command patterns are competitor patterns. It wraps business logic in command beans, decouples the client and business logic tier, and reduces the number of remote method invocations. Q23. What is Ve
